Automatic draft regulator



Dec. 30, 1930. c. J. ASHLEY 1,786,931

AUTOMATIC DRAFT REGULATOR Filed April 29. 1929 2Sheets-Sheet 1 I l I l l i I C. J. ASHLEY Dec. 30, 1930.

AUTOMATIC DRAFT REGULATOR 2 Sheets-She et 2 Filed April 29, 19. 49

5 wvemtoz 1X L n woo Patented Dec. 30, 1930 UNITED STATES RATEN'Il OFFICE cm]: .r. ASHLEY, or coonnons, vmcmm.

aumomrrc mum'r uncommon Application filed Apri128, 1929. Serial No. 859,082.

My invention relates to improvements in automatic draft regulators.

The object of my invention is to provide a draft regulator as a separate element, so constructed that it can be readily attached to the ordinary air-ti ht stove using a down draft, so that the dra to the stove is automatically regulated so that a stove can be kept. at any predetermined even temperature.

Another object of my invention is to r0- vide a draft regulator of'this character aving adjustable means whereby the same can be set so that the damper will be opened or closed by the heat from the stove at different degrees of temperature. a

A further object of my invention is to provide a damper of this character having means for preventing the heat radiating from-the stove, from coming in direct contact with the 2 wafer controlling the damper and said means adjustable, to control the amount of heat radiated from the stove coming into direct contact with the wafer.

A still further object of my invention is to provide a simple chea) and effective draft regulator having certaln details of structure and combination of parts, hereinafter more fully set forth.

' In the accompanying drawings 53 Fig. 1.is a side elevation of an air-tight stove of the down draft type showing my draft regulator applied thereto.

Fig. 2 is an enlarged vertical sectional view of the draft regulator.

Fig. 3 is a top plan view of Fig. 2.

Fig. 4 is a front view'of the plate for preventing the heat radiated from the stove, from coming into direct contact with the wafer.

5 is a similar view showing the plate opened outwardly so that a certain amount of heat radiated from the stove will come in direct contact with the wafer.

Referring now to the drawings, 1 represents an ordinary air-tight stove in which wood is burned and is provided at its upper end with a hinged or removable cover 2 through which the fuel is fed to the stove. The stove is provided with a usual smoke flue 3, arranged at'its upper end and its lower placed drawings.

' the circular end is providedwith an opening to which is connected the pipe 5 leading upwardly along the side of the stove to a point adjacent the upper end of the stove. The upper end of this ipe 5 is usually provided with a damper whic controls the amount of air or draft passing to the lower end of the stove. Itis to be understood that my invention is particularly adapted for this type of stove but the usual stove of this character has the pipe 5 so close to the stove that there is not suflicient room to allow my draft regulator to be between the upper end of the pipe and the stove. 1

Insuch instances the pipe is removed and another pipe applied having an elbow of sulficient length to bring the upper end of the pip/i a considerable distance from the stove. y improved draft regulator comprises a band of metal bent into a circular form and which is adapted to extend around the upper end of the pipe 5 as shown in Fig. l of the The two ends 7 and 8 of the band are spaced apart and have their inner ends turned laterally asindicated at 9 and 10 and these ends are bolted to the vertical wall 10 of the stove by means of bolts 12. The ends 7 and 8 are spaced apart by means of a metal block 13 as shown in Fig. 2 of the drawings and this block is held between the ends 7 'nd 8 by means of bolts 14 and 15. These b its also pass through the upper ends of the U shaped strap 16 and 17 formed integral with plate 18. y This circular plate 18 has secured thereon the ordinary commercial ether wafer 19 and'the upper wall of the wafer has secured thereto a rod 20 which passes upwardly through an opening 21 in the block 13 and is provided at its upper end with a head 22. Extending transversely 5 through the members 7 and 8 is'a rod or bolt 23 upon which is mounted intermediate its ends alever 24 having a weighted end 25 beyond its pivot so that the outer free end 26 of the lever 24, slightly overbalances the weighted end as hereinafter more fully described. Carried by the lever 24 is a set screw 27 which extends through the lever and set screw being adjustable, it will be seen that below the bar 29 is se mental bar 36 the lever can be adjusted to open the damper a greater or less distance. -The band like member 6 surrounding the upper end of the pipe 5 and is closed by a cover 27 having a central opening 28 therein though which freel passes the rod 30 which has its upper end oosely connected to the free end 26 of the lever 24. The lower end of the rod 30 provided with a disc sha ed damper 31 which is of a diameter slig tly greater than the opening 28 in the ca i 27. I

he disc shaped plate 18 is provided at its near end with a downwardly extending member 32 to which is pivotally connected at 33, the lower ends of the two semi-circular concave lates 34 and 35 which are held together or adjusted in any position by means of 9. having projections 37 a apted to cooperate with depressions 38 in the faces of the member 34 and 35. By this structure it will be seen that the plates can be swung upon the pivot 33 so that the heat will be entirely shut off directly from the stove or they can be opened up as shown in Fig. 5, so that the heat radiated from the stove will come in direct contact with the wafer. This arrangement allows of a greater range of temperature of the stove with a limited movement of the damper.

The operation of my device is as follows: When the stove is cold the upper end of the wafer 19 is in the lowermost position and the rod 20 is in a position to allow the lever 2 f to be in a lowered position so that the damper 31 is some distance below the lower face of the .cap 27 to allow air to pass through the opening 28 into the passage or pipe 5 into the lower end of the stove. The passage of air to the stove necessarily causes a draft in the stove and causes the fuel to burn and as the stove heats up the heat therefrom comes directly or indirectly in contact with the wafer 19 causing the liquid or gas therein to expand, forcing the rod 20 upwardly, which in turn engages the lower end of the set screw 27 and forces the lever 24 upwardly causing the rod 30 to raise the damper 31 and gradually closing the opening 28 and shutting off the draft to the stove through the pipe 5. The stove will then cool down and as it cools the wafer 19 contracts lowering the rod 20 which allows the damper to move downward-" ly and gradually allowing more air to pass through the opening 28 in the cap 27 which again causes the fire to burn more freely in the stove. By adjusting the set screw 27 up or down it will be understood that the damper 31 will open to a greater or less extent, therefore it is possible to adjust the damper so that any temperature may be maintained in the room in which the stove is placed.

While I have shown this specific construction and arrangement of damper it will be understood I do not care to limit myself to the same, as the broad invention is the placing of apparatus between the stove and down draft pipe and the specific construction could be greatly varied without departing from my invention.

Having thus fully described my invention what I'claim is 1. The combination with an air-tight stove having'a down draft pipe extending along the side thereof and spaced therefrom, an automatic damper control secured to the stove and having a cap embracing the upper end of the down draft pipe, a damper carried thereby and adapted to automatically control the down draft in said pipe.

2. The combination with an air-tight stove having a down draft pipe extending along the side thereof and spaced therefrom, an automatic damper control means secured to the wall of thestove and having a cap embracing the upper end of the pipe and provided with an opening, a damper controlling said opening and operated by the automatic control between the stove and the pipe.

3. The combination with an air-tight stove having a down draft pipe arranged along the side thereof and spaced therefrom, a frame secured to the stove adjacent said pipe, a cap 'carried by the frame and embracing the upper end of the pipe and having an opening therein, a lever pivoted to said frame and extending over the cap, a damper carried by the outer end of the lever and cooperating with the opening in the cap, an expansible wafer carried by the frame and adapted to operate the lever and controlling the passage of the air through the opening in the 2. The combination with an air-tight stove having a down draft pipe extending along the side thereof and spaced therefrom, a frame secured to the stove adjacent the pipe, a cap carried by the frame and embracing the upper end of the pipe, a lever pivoted in the frame and extending outwardly over the cap, a damper loosely carried by the lever and controlling the opening in the cap and an expanding wafer carried by the frame and having an upwardly extending rod, an adjustable set screw carried by the lever and engaging the rod carried by the wafer.

5. The combination of an air-tight stove having a down draft pipe extending along the side thereof and spaced therefrom, a frame carried by the stove adjacent the pipe and having an automatic heat control means for operating a damper for controlling the supply of air to the pipe and pivoted plates carried by the frame to prevent the radiation of heat from the stove from coming in direct contact with the heat control means.

6. The combination with an-air-tight stove having a down draft pipe extending along the side thereof and spaced therefrom, a frame bolted to the stove and having a cap at its outer end embracing the pipe and having an opening therein, a lever pivoted withy in the frame and extending out over the cap,

a damper loosely carried by the free end of the lever and controlling the opening in the cap and an expansible wafer carried by the frame and having'a rod vertically moved thereby, a set screw carried by the lever intermediate the pivot and the damper and engaging the upper end of the rod whereby e damper may be opened to a greater orless gree by adjusting set screw. In testimony whereof I aifix my signature.

CAMB J. ASHLEY. 

